Not really, I'm not a fan of rivalmance in general. Mostly because it's badly done. I tried all the rivalmances and friendlymances in da2 and yeah rivalmances were quite funny while friendlymances were soo cute and I can't resist it.
Really? You just have to flirt with her and after you slept with her you have to tell her that you have feelings for her, something "what about love?" thing, and then she will be serious about this romance.
Well I hope they will improve it, and I want to have that ability to talk with companions everywhere like in dao.